//Instantiate a Workbook object.
Workbook workbook = new Workbook();
//Load a template file.
workbook.Open("d:\\test\\MyBook.xls");
//Get the first worksheet in the book.
Worksheet sheet = workbook.Worksheets[0];
//Insert 10 rows at row index 2 (insertion starts at 3rd row)
sheet.Cells.InsertRows(2, 10);
//Delete 5 rows now. (8th row - 12th row)
sheet.Cells.DeleteRows(7, 5);
//Save the excel file.
workbook.Save("d:\\test\\MyBook.xls");